LXR linux/tools/testing/selftests/bpf/progs/trace

   1// SPDX-License-Identifier: GPL-2.0
   2// Copyright (c) 2020, Oracle and/or its affiliates.
   3
   4#include "vmlinux.h"
   5#include <bpf/bpf_helpers.h>
   6#include <bpf/bpf_tracing.h>
   7
   8char _license[] SEC("license") = "GPL";
   9
  10int trace_printk_ret = 0;
  11int trace_printk_ran = 0;
  12
  13const char fmt[] = "Testing,testing %d\n";
  14
  15SEC("fentry/__x64_sys_nanosleep")
  16int sys_enter(void *ctx)
  17{
  18        trace_printk_ret = bpf_trace_printk(fmt, sizeof(fmt),
  19                                            ++trace_printk_ran);
  20        return 0;
  21}
  22